Measurement of the decay η′→π0π0η at MAMI (CROSBI ID 278267)
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Adlarson, P. ; Afzal, F. ; Ahmed, Z. ; Akondi, C. S. ; Annand, J. R. M. ; Arends, H. J. ; Beck, R. ; Borisov, N. ; Braghieri, A. ; Briscoe, W. J. ; Cividini, F. ; Collicott, C. ; Costanza, S. ; Denig, A. ; Downie, E. J. ; Dieterle, M. ; Ferretti Bondy, M. I. ; Gardner, S. ; Garni, S. ; Glazier, D. I. ; Glowa, D. ; Gradl, W. ; Gurevich, G. ; Hamilton, D. J. ; Hornidge, D. ; Huber, G. M. ; Käser, A. ; Kashevarov, V. L. ; Kay, S. ; Keshelashvili, I. ; Kondratiev, R. ; Korolija, Milorad ; Krusche, B. ; Lazarev, A. ; Linturi, J. ; Livingston, K. ; MacGregor, I. J. D. ; Manley, D. M. ; Martel, P. P. ; McGeorge, J. C. ; Middleton, D. G. ; Miskimen, R. ; Mushkarenkov, A. ; Neganov, A. ; Neiser, A. ; Oberle, M. ; Ostrick, M. ; Ott, P. ; Otte, P. B. ; Oussena, B. ; Paudyal, D. ; Pedroni, P. ; Polonski, A. ; Prakhov, S. ; Rajabi, A. ; Ron, G. ; Rostomyan, T. ; Sarty, A. ; Sfienti, C. ; Sokhoyan, V. ; Spieker, K. ; Steffen, O. ; Strakovsky, I. I. ; Strub, T. ; Supek, Ivan ; Thiel, A. ; Thiel, M. ; Tiator, L. ; Thomas, A. ; Unverzagt, M. ; Usov, Y. A. ; Wagner, S. ; Watts, D. P. ; Werthmüller, D. ; Wettig, J. ; Witthauer, L. ; Wolfes, M. ; Workman, R. L. ; Zana, L. A.
A2 Collaboration at MAMI
engleski
Measurement of the decay η′→π0π0η at MAMI
An experimental study of the eta' -> pi(0)pi(0)eta -> 6 gamma decay has been conducted with the best up-to-date statistical accuracy, by measuring. 0 mesons produced in the gamma p -> eta'p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The results obtained for the standard parametrization of the eta' -> pi(0)pi(0)eta matrix element are consistent with the most recent results for eta' -> pi pi eta decays, but have smaller uncertainties. The available statistics and experimental resolution allowed, for the first time, an observation of a structure below the pi(+)pi(-) thorn p-mass threshold, the magnitude and sign of which, checked within the framework of the nonrelativistic effective-field theory, demonstrated good agreement with the cusp that was predicted based on the pi pi scattering length combination, a(0)-a(2), extracted from K -> 3 pi decays.
matrix-element ; mass ; microtron ; 3-Pi(0) ; cusps ; ratio
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